225021237 has 32 divisors (see below), whose sum is σ = 373401600. Its totient is φ = 117609408.

The previous prime is 225021229. The next prime is 225021239. The reversal of 225021237 is 732120522.

It is a happy number.

It is not a de Polignac number, because 225021237 - 2³ = 225021229 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225021239) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1848 + ... + 21294.

It is an arithmetic number, because the mean of its divisors is an integer number (11668800).

Almost surely, 2^225021237 is an apocalyptic number.

It is an amenable number.

225021237 is a deficient number, since it is larger than the sum of its proper divisors (148380363).

225021237 is a wasteful number, since it uses less digits than its factorization.

225021237 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19505.

The product of its (nonzero) digits is 1680, while the sum is 24.

The square root of 225021237 is about 15000.7078832967. The cubic root of 225021237 is about 608.2393349144.

Adding to 225021237 its reverse (732120522), we get a palindrome (957141759).

The spelling of 225021237 in words is "two hundred twenty-five million, twenty-one thousand, two hundred thirty-seven".